I don't know that the energy band gap is as important, though I'd imagine the narrower the better. They attempt to maximize the size of their depletion region. Photodiodes (used for PV arrays) are similar, but optimized for a completely different goal. This causes the semiconductor to shed excess electrons as visible light energy. In 2021, our team set out to encourage healthy habits. Rohinnis LightPaper is much thinner than current lighting technology OLED, which has been used in flat. In short, LEDs are semi conductors optimized to have a very specific direct energy band gap which produces photons in the visible light spectrum. The Lightpaper will be released commercially in middle of 2015 and certainly be the next big thing in lighting industry. When a current runs through the paper, the tiny, randomly-dispersed diodes will light up. That is, that good photovoltaic sources would emit heaps of light when a current was applied. So instead, I'll offer some (probably fallacious, but likely still correct in its conclusion) logical deduction - If this was likely to be a good photovoltaic source, the inverse would also likely be true.
I just wrote a long diatribe attempting to explain why using my very limited knowledge of semiconductor physics, but realized I couldn't do so without making some substantial guesses. A company called Rohinni has come up with Lightpaper, which is a printable, paper-thin lighting solution that can be applied to any surface.
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